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Old 3rd August 2011, 03:46 PM   #271
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Biwiring: Use separate cables, not cables that bunch both runs together. You want to avoid coupling between the runs, not promote it. You'll find that with an amp like Ncore, biwiring sounds almost like biamping. Bad for my business to tell you this, I know...

The SMPS400 will do the job, except for maximum power (which is 600W/2ohm on the NC400). We'll make a special SMPS version for the Ncore with all the right connectors but essentially it'll be a beefed up SMPS400.

The MAT14 was indeed for bias current cancellation. However, I forgot that this circuit will add a nonlinear capacitance to the input as well so I decided to drop it. That in addition to the fact that you can't get non-monolithic matched quads. Instead I'll use matched duals which you can get as separate dice, and rearrange them so that the input currents of the two noninverting inputs are matched. Then I can cancel the error with a pot. It's not that critical anyway.
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Last edited by Bruno Putzeys; 3rd August 2011 at 04:08 PM.
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Old 3rd August 2011, 05:40 PM   #272
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bunching cable runs is usually a bad idea as it further adds capacitive coupling but although spaced apart two cable runs still doubles the capacitive coupling like paralleling two capacitors... From my experience this can really screw the balance and performance of a cable, but I donīt know whether that holds true for all amps or the whether the audible effect is reduced by high feedback and low output resistance...

Almost like biwiring, that statement sure helps to sell the first modules
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Old 3rd August 2011, 07:13 PM   #273
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The capacitance in the Ncore module's output filter is 2uF. This is effectively strapped directly across the output terminals. The amplifier wouldn't notice even if you attached 200nF worth of cable. But even for more normal amplifiers, you'll find that the only cable parameter that produces easily measurable differences at the speaker end is inductance. Likewise, speaker cables do not couple capacitively, they couple inductively. Keeping them apart is the easiest way to prevent them from undoing the benefit of biwiring. Another method is the one used in cat5 cables: use different pitches of twist.
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Old 3rd August 2011, 07:50 PM   #274
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My experiences with all sorts of cable fidling is based on ICEpower, arcam and Naim amps so they use quite different approaches concerning output "filter" and on all slight differences in capacitive coupling in the speaker cables were audible and a great concern to get right. Quite similar results actually although the stark differences in the amps...

I havenīt done the same experiements on UCDīs and of course neither the NC with its 2uF! coupling between the outputs -that is A LOT BTW! -Iīll guess the feedback scheme must be really effective to get the output stable with that load Isnīt that cap magnitudes larger than on the UCDīs??

Well Iīll guess as usual there is difference between what is measurable and audible...

BTW CAT5 can actually be made into rather good speaker cable, but IME one separate run for each pole is necessary to get a decent sound...
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Old 3rd August 2011, 07:55 PM   #275
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UcD180 to 400: 680nF. UcD700: 1uF. UcD2k: 2uF. The cap doubles as one of the poles of the feedback loop function so it doesn't get in the way of stability. Quite the contrary. I've always been quite pleased with that idea

Never tried using cat5 like you described. I've always parallelled the pairs (all whites=-, all colours=+). I don't know how big the effect would be but I feel suspicious of loudspeaker currents running round loops where the wires can move.
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Old 3rd August 2011, 10:03 PM   #276
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Hello.
I have been folloving this thread for a while with great interest and as it seems I'm just missing one aspect before adding at least one pair too my christmas list. Do you have any idea how much they will set me back ? The plan so far is 2x smps1200 + 2x NC. I'm not expecting an exact number but some idea would be nice.

Best regards. Bengt Dahlberg
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Old 4th August 2011, 11:01 AM   #277
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Quote:
Originally Posted by dahlberg View Post
Hello.
I have been folloving this thread for a while with great interest and as it seems I'm just missing one aspect before adding at least one pair too my christmas list. Do you have any idea how much they will set me back ? The plan so far is 2x smps1200 + 2x NC. I'm not expecting an exact number but some idea would be nice.

Best regards. Bengt Dahlberg
Maybe I schould clarify that I'm not looking for the cheapest solution possible, I'm quite aware that good quality comes at a price and that's just as it schould be.
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Old 4th August 2011, 12:04 PM   #278
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Default Cat out of the bag?

Quote:
Originally Posted by Bruno Putzeys View Post
Essentially they're UcD180 modules with the modulator stripped out and the Ncore modulator is on the LS1 DSP board. We (Grimm) didn't have time for us (Hypex) to develop a suitable module.
Hi Bruno,

So in theory you could supply us hardcore DIY types with Ncore modulators to retro-fit our existing amps?
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Old 4th August 2011, 01:37 PM   #279
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Price: the internal price discussion is still ongoing.
Retrofit modulator: That would be kinda cool and it's technically feasible but how many of those would we sell? I don't think it's an economical proposition for us to do this. Besides, there are other improvements (most notably idle losses and open-loop distortion) that retrofitted modules wouldn't benefit from.
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Old 4th August 2011, 09:29 PM   #280
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Default Ncore modulator

Hello Bruno

What is the THD improvement alone of the Ncore modulator compared to the standard modulator.

When are the hypex modules expected to be made with this modulator advance.
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